Icon for a display screen



FIG. 1 is a perspective view of an icon for a display screen;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is a front elevational view thereof, on an enlarged scale.

The broken line drawings of computer display screens in FIGS. 1-3 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an icon for a display screen, as shown and described. 